Bosch EVX-BA User Manual

EVX-BA

The EVX-BA provides a means to switch in a backup amplifier in the event of a primary amp failure. One backup amp can be provided in reserve for several primary amps. Amplifier outputs are connected at TB2, and speaker field wiring at TB1. Supervisory and 24 VDC power inputs are provided at TS1. The LED on-board activates when the backup amp has been switched in. All wiring is power-limited. Mounts to snaptrack or 5/8” nylon standoffs.

The EVX-BA is compatible with both 25VRMS and 70VRMS audio signals.

INSTALLATION:

Mounting: The EVX-BA is mounted in the same cabinet that houses the primary amplifier. It is designed to be mounted into standard 3” snap track material. The board also has mounting holes at the corners for stand-off mounts where necessary. 5/8” nylon standoffs are required.

TS1:

Ter. 1 - Ckt. Neg Ter. 2 - +24 VDC Ter. 3 - Gen Input Ter. 4 - +24 VDC

TB1:

Ter. 1 & 2 - Audio Output

TB2:

Ter. 1& 2 - Audio Input from backup

amplifier

Ter. 3&4 - Audio Input from primary amplifier

JUMPERS: J1: jumps TS1-2 to TS1-4

LED

TB1

TS1

Fig. 1 - Board

4 3 2 1

SPECIFICATIONS:

Power: 24 VDC Current: 40 mA Standby 10 mA Active

TB2

BA-100 Rev C

P/N 1-5030 REV. B

Fig. 2 - Typical Connection Detail

LED activates when

backup audio is

switched in

Install jumper J1

to eliminate

TS1 2 - 4 connection

Speaker Output

FROM PRIMARY AMP

TB-2

TB-3#7TB-2

#10

TS1

4 3 2 1

LED

TB1

NOTE:

If primary amplifier is an

EVX-25, EVX-50, or EVX-100

place dipswitch #5 on SN-2

of that amp DOWN

If primary amplifier is an

EVX-25E, EVX-50E, or EVX-100E

place dipswitch #5 on SN-1

of that amp DOWN

Backup amp

EOLR at last EVX-BA

Input from backup amplifier (TB-1 #5-6)

Input from primary amplifier (TB-1 #5-6)

TB2

BA-100 Rev C

SOUND SOLUTIONS

SYSTEMS

TECH SUPPORT

888-382-9835

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